After a satified year of having weboost with fixed mount including spring, I installed the weboost adjustable mount and removed the spring.
I removed the spring because I'm not on rough roads a lot and antenna sway on freeways nill.
I did mount, the adjustable mount close behind my p/u cab and the antenna just clears the top of cab for best 365 reception coverage. Mounted close behind the cab allows me it lay it down and dive through car washes and the antenna remains untouch by car wash brushed, so far. See pics.